“The free fall is very scary. I did it five times in a row to try to get used to it, but it was still just as frightening the fifth time as the first.” The words of Pete, a caving instructor and former soldier who fought in Afghanistan, are ringing in my ears as I stand at the top of a 21-metre abyss. The thin beam of light from my head torch barely penetrates the darkness; it is just enough to make out the edge of the cliff and the black nothingness below. I count to three – and step off.
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